package f_StringBuilder;

import java.util.Scanner;

/**
 * @author Cheng-02
 * @version V1.0
 * @Package f_StringBuilder
 * @date 2024/4/6 12:56
 */
public class test02 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        StringBuilder sb= new StringBuilder(sc.nextLine());
        if(sb.equals(sb.reverse())){
            System.out.println("是回文");
        }else{
            System.out.println("不是回文");
        }
    }
}
